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<!DOCTYPE html>
<html>
<title>WebGPU ResizeObserver test (ref)</title>
<meta charset="utf-8" />
<link rel="help" href="https://gpuweb.github.io/gpuweb/" />
<style>
.outer {
display: flex;
align-items: center;
flex-direction: column;
}
.outer>* {
display: block;
height: 100px;
}
</style>
<body>
<div id="dpr"></div>
<div class="outer"></div>
<script type="module">
import { takeScreenshotDelayed } from '../../../../common/util/wpt_reftest_wait.js';
import createPatternDataURL from '../create-pattern-data-url.js';
(async () => {
const {patternSize, dataURL} = createPatternDataURL();
document.querySelector('#dpr').textContent = `dpr: ${devicePixelRatio}`;
/**
* Set the pattern's size on this element so that it draws where
* 1 pixel in the pattern maps to 1 devicePixel.
*/
function setPattern(elem) {
const oneDevicePixel = 1 / devicePixelRatio;
const patternPixels = oneDevicePixel * patternSize;
elem.style.backgroundImage = `url("${dataURL}")`;
elem.style.backgroundSize = `${patternPixels}px ${patternPixels}px`;
}
/*
This ref creates elements like this
<body>
<div class="outer">
<div></div>
<div></div>
<div></div>
...
</div>
</body>
Where the outer div is a flexbox centering the child elements.
Each of the child elements is set to a different width in percent.
The devicePixelContentBox size of each child element is observed
with a ResizeObserver and when changed, a pattern is applied to
the element and the pattern's size set so each pixel in the pattern
will be one device pixel.
A similar process happens in the test HTML using canvases
and patterns generated using putImageData.
The test and this reference page should then match.
*/
const outerElem = document.querySelector('.outer');
let resolve;
const promise = new Promise(_resolve => (resolve = _resolve));
/**
* Set the pattern's size on this element so that it draws where
* 1 pixel in the pattern maps to 1 devicePixel.
*/
function setPatterns(entries) {
for (const entry of entries) {
setPattern(entry.target)
}
resolve();
}
const observer = new ResizeObserver(setPatterns);
for (let percentSize = 7; percentSize < 100; percentSize += 13) {
const innerElem = document.createElement('div');
innerElem.style.width = `${percentSize}%`;
observer.observe(innerElem, {box:"device-pixel-content-box"});
outerElem.appendChild(innerElem);
}
await promise;
takeScreenshotDelayed(50);
})();
</script>
</body>
</html>
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